CN111032268B - Method for manufacturing heat conductive plate and friction stir welding method - Google Patents

Abstract

The technical problem is to provide a manufacturing method of a thermally conductive plate, which can reduce the step groove on the surface of the metal member, and can reduce the joint surface roughness. The present invention is characterized in that the taper angle of the proximal side pin (F2) is larger than the taper angle of the distal side pin (F3), and a stepped portion is formed on the outer peripheral surface of the proximal side pin (F2), In the final joining step, the front end side pin (F3) of the rotating final joining rotary tool (F) is inserted into the abutting part (J), and the outer peripheral surface of the proximal end side pin (F2) is connected to the base member (2) Friction stirring is performed in a state where the front surface (2a) of the cover plate (5) is in contact with the front surface (5a) of the cover plate (5).

Description

Manufacturing method of thermally conductive plate and friction stir welding method

technical field

The present invention relates to a manufacturing method of a heat conducting plate and a friction stir welding method.

Background technique

As a rotary tool for friction stir welding, there is known a rotary tool including a shoulder and a stirring pin depending from the shoulder. The said rotary tool performs friction stir welding in the state which press-fit the lower end surface of a shoulder part into a metal member. By pressing the shoulder portion into the metal member, the plastic flow material can be pressed and the occurrence of burrs can be suppressed. However, defects are easily generated when the height position of the bonding is changed, and there is a problem that the step groove becomes large while generating a large amount of burrs.

On the other hand, there is known a friction stir welding method for joining two metal members using a rotating tool including a stirring pin, which is characterized by including a main joining step in which a rotating stirring pin is inserted into Friction stir welding is performed in a state where only the stirring pin is brought into contact with the metal member to the butting portion of the metal members (Patent Document 1). According to the above-mentioned prior art, the spiral groove is engraved on the outer peripheral surface of the stirring pin, and the friction stir welding is performed in a state where only the stirring pin is brought into contact with the member to be joined and the base end portion is exposed. Changes can also suppress the generation of defects, and can also reduce the load on the friction stirring device. However, since the plastic flow material is not pressed by the shoulder portion, there is a problem that the stepped groove on the surface of the metal member becomes large, and the joint surface roughness becomes large. In addition, there is a problem that a raised portion (a portion where the surface of the metal member is raised compared to before joining) is formed in the vicinity of the stepped groove.

On the other hand, Patent Document 2 describes a rotary tool including a shoulder portion and a stirring pin that hangs down from the shoulder portion. Tapered surfaces are formed on the shoulders and the outer peripheral surfaces of the stirring pins, respectively. On the tapered surface of the shoulder portion, a spiral groove is formed in a plan view. The cross-sectional shape of the groove is semicircular. By providing the tapered surface, stable joining is possible even if the thickness of the metal member and the height position of joining are changed. In addition, by entering the plastic flow material into the grooves, the flow of the plastic flow material can be controlled to form a desired plasticized region.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2013-39613

Patent Document 2: Japanese Patent No. 4210148

SUMMARY OF THE INVENTION

The technical problem to be solved by the invention

However, according to the prior art of Patent Document 2, since the plastic flow material enters the inside of the groove of the tapered surface, there is a problem that the groove cannot function. In addition, when the plastic flow material enters the groove, the plastic flow material is friction stirred while adhering to the groove, and therefore, there is a problem that the metal member to be joined and the adherent rub against each other, thereby degrading the quality of the joining. In addition, there is a problem that the surface of the metal member to be joined becomes rough, the burrs increase, and the level groove on the surface of the metal member also becomes large.

From such a viewpoint, the technical problem of the present invention is to provide a method for manufacturing a thermally conductive plate and a method for friction stir welding, which can reduce the stepped groove on the surface of the metal member and reduce the surface roughness of the joint.

Technical solutions adopted to solve technical problems

In order to solve the above-mentioned technical problem, the present invention is characterized by including: a cover plate inserting process, in which the cover plate is inserted into a cover groove formed around a groove, the groove being opened in the base member a front surface; and a final joining step in which a rotary tool including a base end side pin and a front end side pin is relatively moved along a butting portion of the side wall of the cover groove and the side surface of the cover plate, For friction stirring, the taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped portion is formed on the outer peripheral surface of the base end side pin. In the joining step, the front end side pin of the rotating tool that is rotated is inserted into the abutting portion, and the outer peripheral surface of the base end side pin is brought into contact with the front surface of the base member and the cover plate. Friction stirring.

Further, the present invention is characterized by including a heat medium pipe inserting step in which the heat medium pipe is inserted into a groove formed on a bottom surface of a cover groove, the cover groove being opened in the front surface of the base member; a cover inserting step of inserting a cover into the cover groove; and a final joining step of including a base end side pin and a front end The rotating tool of the side pin moves relatively along the butting portion of the side wall of the cover groove and the side surface of the cover plate to perform friction stirring, and the taper angle of the base end side pin is smaller than the taper angle of the front end side pin. The shape angle is large, and a stepped portion is formed on the outer peripheral surface of the base end side pin. Friction stirring is performed in a state in which the outer peripheral surface of the base end side pin is brought into contact with the front surfaces of the base member and the cover plate.

In addition, the present invention is characterized by including: a sealing step, in which the cover plate and the front surface of the base member are overlapped to cover the groove or recess opened on the front surface of the base member; and a formal joining step, In the main joining step, a rotating tool including a proximal end pin and a distal end pin is inserted from the front surface of the cover plate, and the rotating tool is caused to extend along the front surface of the base member and the back surface of the cover plate The overlapping portion of the base end side moves relatively, the taper angle of the base end side pin is larger than the taper angle of the front end side pin, and a stepped portion is formed on the outer peripheral surface of the base end side pin. In the main joining step, while the outer peripheral surface of the base end side pin is brought into contact with the front surface of the cover plate, the front end side pin is brought into contact with both the base member and the cover plate, or with only the cover plate. Friction stirring of the overlapping portion is performed in a state where the cover plates are in contact.

In addition, the present invention is characterized by including: a sealing step, in which the cover plate and the front surface of the base member are overlapped to cover the groove or recess opened on the front surface of the base member; and a formal joining step, In the main joining step, a rotary tool including a proximal end pin and a distal end pin is inserted from the back surface of the base member, and the rotary tool is caused to extend along the front surface of the base member and the back surface of the cover plate The overlapping portion of the base end side moves relatively, the taper angle of the base end side pin is larger than the taper angle of the front end side pin, and a stepped portion is formed on the outer peripheral surface of the base end side pin. In the main joining step, while the outer peripheral surface of the base end side pin is brought into contact with the back surface of the base member, the tip end side pin is brought into contact with both the base member and the cover plate, or with only the base member. The friction stirring of the overlapping portion is performed in a state where the base members are in contact.

Further, the present invention is a friction stir welding method in which two metal members are joined using a rotary tool including a base end pin and a tip end pin, wherein the base end side pin has a taper angle greater than The tip side pin has a large taper angle, a stepped portion is formed on the outer peripheral surface of the base end side pin, and the friction stir welding method includes a step of forming an overlapped portion, and in the step of forming the overlapped portion , overlapping the front surface of one of the metal members with the rear surface of the other metal member to form an overlapping portion; and a final joining step in which the front end side of the rotating tool that is rotated A pin is inserted from the front surface of the other metal member, and the front end side pin is brought into contact with the one metal member while the outer peripheral surface of the base end side pin is brought into contact with the front surface of the other metal member. In a state where both the member and the other metal member are in contact or in contact with only the other metal member, friction stirring of the overlapping portion is performed, and the hardness of the other metal member is set to The hardness is lower than that of one of the metal members.

According to the above method, the base member and the cover plate or the metal member can be pressed by the outer peripheral surface of the base end side pin with a large taper angle, therefore, the step groove of the joint surface can be reduced, and the formation of the groove can be eliminated or reduced. The bulge near the step groove. Since the stepped portion is shallow and has a large outlet, even if the metal member is pressed by the base end pin, the plastic flow material does not easily adhere to the outer peripheral surface of the base end side pin. Therefore, the joint surface roughness can be reduced, and the joint quality can be desirably stabilized. In addition, by including the front end side pin, it can be easily inserted into a deep position.

Furthermore, it is preferable that a temporary bonding process is included before the main bonding process, and in the temporary bonding process, the butted portion is temporarily bonded. Furthermore, it is preferable that a temporary bonding process is included before the main bonding process, and in the temporary bonding process, the overlapping portion is temporarily bonded. According to the above-described manufacturing method, it is possible to prevent cracking of the butted portion or the overlapping portion during the main joining process.

Moreover, it is preferable to include a burr cutting process after the completion of the main joining process, and in the burr cutting process, the burrs generated by the friction stirring of the rotary tool are cut off. According to the above-mentioned method, the joint surface can be finished to be neat.

Invention effect

According to the manufacturing method of the thermally conductive plate and the friction stir welding method of the present invention, the step groove on the surface of the metal member can be reduced, and the joint surface roughness can be reduced.

Description of drawings

FIG. 1 is a side view showing a rotary tool for final joining used in a joining method according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a rotary tool for final joining.

FIG. 3 is a cross-sectional view showing a first modification of the final joining rotary tool.

FIG. 4 is a cross-sectional view showing a second modification of the final joining rotary tool.

FIG. 5 is a cross-sectional view showing a third modification of the final joining rotary tool.

6 is a perspective view showing a heat transfer plate according to the first embodiment of the present invention.

7A is a cross-sectional view showing a preparation process of the method of manufacturing the thermally conductive plate according to the first embodiment.

7B is a cross-sectional view showing a cover plate insertion step in the method of manufacturing the thermally conductive plate according to the first embodiment.

FIG. 8 is a plan view showing a tab arranging step in the method of manufacturing the thermally conductive plate according to the first embodiment.

9A is a cross-sectional view showing a method of manufacturing the thermally conductive plate according to the first embodiment, which shows a temporary bonding step.

9B is a cross-sectional view showing the method of manufacturing the thermally conductive plate according to the first embodiment, and shows a main joining step.

FIG. 10A is a conceptual diagram showing a conventional rotary tool.

FIG. 10B is a conceptual diagram showing a conventional rotary tool.

11A is a cross-sectional view showing a method of manufacturing a thermally conductive plate according to a second embodiment of the present invention, and shows a preparation step.

11B is a cross-sectional view showing a method of manufacturing a thermally conductive plate according to the second embodiment of the present invention, and shows a cover plate insertion step.

FIG. 12 is a cross-sectional view showing a main joining step of the second embodiment.

13A is a cross-sectional view showing a method of manufacturing a thermally conductive plate according to a third embodiment of the present invention, and shows a temporary bonding step.

13B is a cross-sectional view showing a method of manufacturing the thermally conductive plate according to the third embodiment, and shows a main bonding step.

14A is a cross-sectional view showing a method of manufacturing a thermally conductive plate according to a fourth embodiment of the present invention, which shows a temporary bonding step.

14B is a cross-sectional view showing a method of manufacturing the thermally conductive plate according to the fourth embodiment of the present invention, and shows a main joining step.

15 is a cross-sectional view showing a friction stir welding method according to a fifth embodiment of the present invention.

16 is a cross-sectional view showing a modification of the fifth embodiment.

Detailed ways

Embodiments of the present invention will be described with reference to the accompanying drawings as appropriate. First, the rotary tool (rotary tool) for actual joining used in the joining method of the present embodiment will be described. The rotary tool for full welding is a tool used for friction stir welding. As shown in FIG. 1, the rotary tool F for final joining is formed of, for example, tool steel, and is mainly composed of a base shaft portion F1, a base end side pin F2, and a distal end side pin F3. The base shaft portion F1 has a cylindrical shape and is connected to the main shaft of the friction stirrer.

The base end side pin F2 is continuous with the base shaft portion F1, and is tapered toward the distal end. The base end side pin F2 has a truncated cone shape. The taper angle A of the proximal-end side pin F2 may be appropriately set, but is, for example, 135 to 160°. When the taper angle A is smaller than 135° or larger than 160°, the joint surface roughness after friction stirring becomes large. The taper angle A is larger than the taper angle B of the tip-side pin F3 to be described later. As shown in FIG. 2, the stepped part F21 is formed in the outer peripheral surface of the base end side pin F2 over the whole height direction. The stepped portion F21 is formed in a spiral shape by winding rightward or leftward. That is, the stepped portion F21 has a spiral shape in a plan view, and a stepped shape in a side view. In this embodiment, since the rotary tool F for final joining is rotated rightward, the stepped portion F21 is set so as to surround leftward from the base end side to the distal end side.

In addition, it is preferable that the stepped portion F21 is set so as to surround rightward from the proximal end side to the distal end side when the final joining rotary tool F is rotated leftward. Thereby, since the plastic flow material is guided to the front end side by the stepped portion F21, the metal that overflows to the outside of the metal member to be joined can be reduced. The stepped portion F21 is composed of a stepped bottom surface F21a and a stepped side surface F21b. The distance X1 (horizontal direction distance) of each vertex F21c, F21c of the adjacent level difference part F21 is set suitably based on the level difference angle C and height Y1 of the level difference side surface F21b mentioned later.

The height Y1 of the step side surface F21b may be appropriately set, but is set to, for example, 0.1 to 0.4 mm. When the height Y1 is less than 0.1 mm, the surface roughness of the joint becomes large. On the other hand, when the height Y1 is larger than 0.4 mm, the joint surface roughness tends to increase, and the number of effective stepped portions (the number of stepped portions F21 in contact with the metal member to be joined) also decreases.

The step angle C formed by the step bottom surface F21a and the step side surface F21b may be appropriately set, but is set to 85 to 120°, for example. In the present embodiment, the stepped bottom surface F21a is parallel to the horizontal plane. The step bottom surface F21a may be inclined within a range of -5° to 15° with respect to the horizontal plane from the rotational axis of the tool to the outer circumferential direction (the lower side of the horizontal plane is negative, and the upper side of the horizontal plane is positive). The distance X1, the height Y1 of the step side surface F21b, the step angle C, and the angle of the step bottom surface F21a with respect to the horizontal plane are appropriately set so that the plastic flow material does not stay and adhere to the inside of the step portion F21 during friction stirring. , but is discharged to the outside, and the plastic flow material can be pressed by the step bottom surface F21a to reduce the joint surface roughness.

As shown in FIG. 1, the distal end side pin F3 and the proximal end side pin F2 are formed continuously. The tip side pin F3 has a truncated cone shape. The front end of the front end side pin F3 is a flat surface. The taper angle B of the tip side pin F3 is smaller than the taper angle A of the base side pin F2. As shown in FIG. 2 , a helical groove F31 is engraved on the outer peripheral surface of the tip-side pin F3. Although the spiral groove F31 may be rounded rightward or leftward, in this embodiment, since the rotary tool F for final joining is turned rightward, it is engraved to be rounded leftward from the base end side to the front end side.

In addition, it is preferable to set the spiral groove F31 so as to surround rightward from the base end side to the distal end side when the final joining rotary tool F is rotated leftward. Thereby, since the plastic flow material is guided to the front end side by the spiral groove F31, the metal overflowing to the outside of the metal member to be joined can be reduced. The spiral groove F31 is constituted by a spiral bottom surface F31a and a spiral side surface F31b. Let the distance (horizontal direction distance) of vertexes F31c and F31c of adjacent spiral grooves F31 be length X2. Let the height of the spiral side surface F31b be the height Y2. The helical angle D constituted by the helical bottom surface F31a and the helical side surface F31b is formed to be, for example, 45 to 90°. The spiral groove F31 has a function of increasing frictional heat by contacting the metal member to be joined, and guiding the plastic flow material to the front end side.

The rotary tool F for final joining can be appropriately changed in design. 3 is a side view showing a first modification of the rotary tool of the present invention. As shown in FIG. 3 , in the final joining rotary tool FA of the first modification, the step angle C formed by the step bottom surface F21a and the step side surface F21b of the step portion F21 is 85°. The level difference bottom surface F21a is parallel to the horizontal plane. In this way, the step bottom surface F21a may be made parallel to the horizontal plane, and the step angle C may be an acute angle in the range where the plastic flow material does not stay and adhere to the step portion F21 but is discharged to the outside during friction stirring.

4 is a side view showing a second modification of the rotary tool for final joining according to the present invention. As shown in FIG. 4 , in the final joining rotary tool FB of the second modification, the step angle C of the step portion F21 is 115°. The level difference bottom surface F21a is parallel to the horizontal plane. In this way, the step bottom surface F21a may be made parallel to the horizontal plane, and the step angle C may be an obtuse angle within a range that functions as the step portion F21.

5 is a side view showing a third modification of the rotary tool for final joining of the present invention. As shown in FIG. 5 , in the final joining rotary tool FC of the third modification, the stepped bottom surface F21a is inclined upward by 10° with respect to the horizontal surface in the outer circumferential direction from the rotational axis of the tool. The level difference side surface F21b is parallel to the plumb bob surface. In this manner, the step bottom surface F21a may be formed so as to be inclined upward from the rotation axis of the tool in the outer peripheral direction from the horizontal surface within a range in which the plastic flow material can be pressed during friction stirring. The same effects as those of the following embodiments can also be obtained by the first to third modified examples of the above-described main-joining rotary tool.

[First Embodiment]

Next, the thermally conductive plate of the present embodiment will be described. The "front surface" in the following description refers to the surface on the opposite side to the "rear surface". As shown in FIG. 6 , the heat transfer plate 1 of the present embodiment is mainly composed of a base member 2 and a cover plate 5 . The base member 2 has a substantially rectangular parallelepiped shape. The base member 2 is formed with a groove 3 and a cover groove 4 . The material of the base member 2 and the cover plate 5 is not limited as long as friction stirring is possible, but in this embodiment, it is an aluminum alloy. The base member 2 is formed of, for example, a material having a higher hardness than that of the cover plate 5 .

The groove 3 penetrates from one side to the other at the center of the base member 2 . The groove 3 is recessed on the bottom surface of the cover groove 4 . The bottom of the groove 3 is annular. The opening of the groove 3 is open toward the side of the front surface 2a of the base member 2 .

The cover groove 4 is wider than the groove 3 and is formed so as to be continuous with the groove 3 on the side of the front surface 2 a of the groove 3 . The cover groove 4 has a rectangular shape when viewed in cross-section, and is open to the side of the front surface 2a.

The cover plate 5 is a plate-shaped member inserted into the cover groove 4 . The cover plate 5 has the same shape as the hollow portion of the cover groove 4 and is inserted into the cover groove 4 without a gap.

A pair of side walls of the cover groove 4 are butted against a pair of side surfaces of the cover plate 5 to form butting portions J, J. The butted parts J, J are joined by friction stirring over the entire depth direction. The space enclosed by the groove 3 of the heat-conducting plate 1 and the lower surface of the cover plate 5 constitutes a flow path for fluid to circulate.

Next, the manufacturing method of the heat transfer plate of 1st Embodiment is demonstrated. In the manufacturing method of a heat transfer plate, a preparation process, a cover plate insertion process, a joint material arrangement process, a temporary joining process, and a main joining process are performed.

As shown in FIG. 7A , the preparation step is a step of preparing the base member 2 . First, the base member 2 is fixed to the stand K via a jig (not shown). Next, the groove 3 and the cover groove 4 are formed by cutting using an end mill or the like. In addition, the base member 2 in which the groove 3 and the cover groove 4 are formed in advance by casting, extrusion, or the like may also be used.

As shown in FIG. 7B , the cover plate insertion step is a step of inserting the cover plate 5 into the cover groove 4 . The side walls of the cover groove 4 and the side surfaces of the cover plate 5 are respectively butted to form butting portions J and J. The front surface 5a of the cover plate 5 is coplanar with the front surface 2a.

As shown in FIG. 8 , the fitting arrangement step is a step of arranging the fittings 10 and 10 on the side surface of the base member 2 . The joint 10 is a member for setting the start position and the end position of friction stirring which will be described later. The joint 10 is in contact with the opposite side surfaces of the base member 2, and is arranged on the extension line of the abutting parts J, J. In the present embodiment, the joint 10 is formed of the same material as the base member 2 , that is, an aluminum alloy. The joint piece 10 is joined by welding the joint piece 10 to the inner corner of the base member 2 .

As shown in FIG. 9A , the temporary bonding step is a step of performing friction stir welding on the butted parts J and J in advance using the temporary bonding rotary tool G. As shown in FIG. The temporary joining rotary tool G is composed of a shoulder portion G1 and a stirring pin G2 suspended from the shoulder portion G1. The start position and the end position of the temporary bonding process are not limited as long as they are on the front surface of the base member 2 and the joint material 10 , but are set on the front surface of the joint material 10 in the present embodiment.

Specifically, the start position of the temporary welding process is set to the front surface of one joint material 10 , and friction stir welding is performed over the entire length of one butt portion J. The plasticized region W1 is formed on the movement trajectory of the rotary tool G for temporary bonding. Once the temporary joining rotary tool G is moved to the other joint member 10 , the front surface of the joint member 10 is directly folded back to perform friction stir welding over the entire length of the other butt portion J. Once the temporary joining rotary tool G is moved to one joint piece 10 , the temporary joining rotary tool G is released from the joint piece 10 .

As shown in FIG. 9B , the final welding step is a step of friction stir welding of the facing parts J and J using the rotary tool F for final welding. Preferably, the start position and the end position of the main joining process are set on the front surface of the joint member 10 . When inserting the rotary tool F for final joining into the joint piece 10, the through hole of the rotary tool G for temporary joining may be used, or a bottom hole may be provided in the joint piece 10 separately so that the rotary tool F for final joining can be inserted from the bottom of the joint piece 10. hole insertion.

In the main welding step, friction stir welding is performed in a state in which the base end side pin F2 and the distal end side pin F3 are brought into contact with the base member 2 and the cover plate 5 . The front side 2a of the base member 2 and the front side 5a of the cover plate 5 are pressed by the outer peripheral surface of the base side pin F2 while inserting the front end side pin F2 of the rotary tool F for final engagement that has been rotated into the abutting portion J. Friction stir joining. The rotary tool F for final joining is relatively moved along the facing portion J. The insertion depths of the proximal pin F2 and the distal pin F3 may be appropriately set within a range in which the outer peripheral surface of the proximal pin F2 can press the front surface 2a of the base member 2 and the front surface 5a of the cover plate 5 . For example, the insertion depths of the proximal end side pin F2 and the distal end side pin F3 may be set within a range in which the outer peripheral surface of the proximal end side pin F2 can press the front surface 2 a of the base member 2 and the front surface 5 a of the cover plate 5 . so that the front end side pin F3 reaches the cover groove 4 . In this embodiment, it is set so that the center part vicinity of the height direction of the outer peripheral surface of the base end side pin F2 contacts the front surface 2a of the base member 2 and the front surface 5a of the cover plate 5. The plasticized region W is formed on the movement locus of the rotary tool F for final joining. Once the main joining process is completed, the joint piece 10 is cut off from the base member 2 .

In addition, a burr cutting process may be performed after completion of the main joining process, and in the above-mentioned burr cutting process, the burrs generated by friction stirring may be cut off. By performing the burr cutting process, the front surfaces of the base member 2 and the cover plate 5 can be finished neatly.

Here, for example, as shown in FIG. 10A , in the case of the conventional rotary tool 200, since the front surface of the metal member 210 to be joined is not pressed by the shoulder portion, there is a stepped groove (by the metal to be joined) The front surface of the member and the front surface of the plasticized region constitute a large groove), and the joint surface roughness becomes large. In addition, there is a problem that a raised portion (a portion where the surface of the metal member to be joined is raised as compared with before joining) is formed in the vicinity of the stepped groove. On the other hand, if the taper angle β of the rotary tool 201 is larger than the taper angle α of the rotary tool 200 as in the rotary tool 201 of FIG. Pressing is performed, so that the step groove becomes smaller and the raised portion becomes smaller. However, since the downward plastic flow becomes stronger, kissing (Japanese: キッシングボンド) is likely to be formed in the lower part of the plasticized region.

On the other hand, the final joining rotary tool F of the present embodiment includes a proximal end side pin F2 and a distal end side pin F3, and the taper angle of the distal end side pin F3 is larger than the taper angle A of the proximal end side pin F2. Small. Thereby, it becomes easy to insert the rotary tool F for final joining into the abutment part J. Moreover, since the taper angle B of the front-end|tip side pin F3 is small, the rotary tool F for final joining can be inserted into the deep position of the abutment part J easily. In addition, since the taper angle B of the tip-side pin F3 is small, the downward plastic flow can be suppressed as compared with the rotary tool 201 . Therefore, it is possible to prevent the formation of a kiss in the lower part of the plasticized region W. On the other hand, since the taper angle A of the base end side pin F2 is large, stable joining is possible even if the thickness of the metal member to be joined and the joining height position are changed compared with the conventional rotary tool.

In addition, the plastic flow material can be pressed by the outer peripheral surface of the base end side pin F2, therefore, the stepped groove formed on the joint surface can be reduced, and the raised portion formed in the vicinity of the stepped groove can be eliminated or reduced . In addition, the stepped portion F21 is shallow and has a large outlet, so that the plastic flow material is easily discharged to the outside of the stepped portion F21 by pressing the plastic flow material by the stepped bottom surface F21a. Therefore, even if the plastic flow material is pressed by the base end side pin F2, the plastic flow material is less likely to adhere to the outer peripheral surface of the base end side pin F2. Thereby, the joint surface roughness can be reduced, and the joint quality can be desirably stabilized.

In addition, in the main joining process, it is not always necessary to perform friction stirring over the entire length in the depth direction of the butted parts J and J, but if the friction stirring is performed over the entire length in the depth direction of the butted parts J, it is possible to improve the Water tightness and air tightness of the thermally conductive plate 1 .

Moreover, by performing the temporary joining process, the base member 2 and the cover plate 5 can be prevented from being cracked when the main joining process is performed. In addition, in the temporary joining process and the main joining process, unless the rotary tool G for temporary joining and the rotary tool F for final joining are not separated from the base member 2 in the middle of the friction stirring, each rotary tool is moved in a single stroke. Moving, it can reduce the working hours.

In addition, in the temporary bonding step, friction stirring may be discontinuously performed to intermittently form the plasticized region W1 by the rotary tool G for temporary bonding. In addition, in the temporary joining process, the butted parts J and J may be joined by welding. In addition, the joint 10 and the base member 2 may be temporarily joined using the rotary tool G for temporary joining.

[Second Embodiment]

Next, a second embodiment of the present invention will be described. The heat transfer plate of the second embodiment differs from the first embodiment in that the heat medium tube 6 is included. The heat medium pipe 6 is a member through which fluid flows.

In the manufacturing method of the heat transfer plate of 2nd Embodiment, a preparation process, the tube insertion process for heat medium, the cover plate insertion process, the temporary joining process, and the main joining process are performed.

As shown in FIG. 11A , the preparation step is a step of preparing the base member 2 .

As shown in FIG. 11B , the heat medium pipe insertion step is a step of inserting the heat medium pipe 6 into the groove 3 . The size and the like of the groove 3 and the heat medium pipe 6 may be appropriately set, but in this embodiment, the outer diameter of the heat medium pipe 6 is substantially the same as the width and depth of the groove 3 .

The cover plate insertion step is a step of inserting the cover plate 5 into the cover groove 4 . The side wall of the cover groove 4 is abutted with the side surface of the cover plate 5 to form a butt joint J. When the cover plate 5 is inserted into the cover groove 4 , the heat medium tubes 6 are in contact with the cover plate 5 , and the front surface 2 a of the base member 2 is coplanar with the front surface 5 a of the cover plate 5 .

The temporary joining process is a process of joining the butted parts J and J in advance. The temporary bonding process is performed in the same manner as in the first embodiment.

As shown in FIG. 12 , the final welding step is a step of friction stir welding of the facing parts J and J using the rotary tool F for final welding. The main joining process is performed in the same manner as in the first embodiment. The plasticized regions W and W are formed on the movement locus of the rotary tool F for final joining. The plasticized region W is formed over the entire length in the depth direction of the butted parts J and J.

According to the manufacturing method of the thermally conductive plate of the second embodiment, substantially the same effects as those of the first embodiment can be achieved. In addition, the heat transfer plate 1A including the heat medium tubes 6 can be easily manufactured.

In addition, for example, the shape of the groove|channel 3, the cover groove 4, the cover plate 5, and the heat-medium pipe 6 of 1st Embodiment and 2nd embodiment is only an example, and other shapes may be sufficient. In addition, when a level difference occurs between the front surface 2a of the base member 2 and the front surface of the plasticized region W after the main joining process, overlay welding may be performed to fill the level difference. Alternatively, a metal member may be arranged on the front surface of the plasticized region W, and friction stir welding may be performed on the metal member and the base member 2 with the rotary tool F for main welding.

In addition, although the case where the cover groove 4 is provided is illustrated in this embodiment, the cover plate 5 may be directly inserted into the groove 3 without providing the cover groove 4 .

In addition, as shown in FIG. 12, when the cavity Q is formed around the heat medium pipe 6, the cavity Q may be filled in the main joining step. In the cover plate insertion step, when the cover plate 5 is inserted into the cover groove 4 , the cavity Q is formed by the groove 3 , the lower surface of the cover plate 5 , and the heat medium pipe 6 . The positions of the butted parts J and J are brought close to the heat medium pipe 6 , and the plastic flow material formed by the main joining rotary tool F is made to flow into the void part Q in the final joining step. As a result, the voids Q around the heat medium pipe 6 are filled with metal, so that the watertightness and airtightness can be further improved.

[Third Embodiment]

Next, a third embodiment of the present invention will be described. The manufacturing method of the heat transfer plate of the third embodiment differs from the first embodiment in that the cover groove 4 is not formed in the base member 2 , and the cover plate 5 is placed on the front surface 2 a of the base member 2 .

In the manufacturing method of the thermally conductive plate of the third embodiment, a preparation process, a groove sealing process, a temporary joining process, and a main joining process are performed.

As shown in FIG. 13A , the preparation step is a step of preparing the base member 2 . A groove 3 is formed on the front surface 2a of the base member 2 .

The groove closing step (closing step) is a step of placing the cover plate 5 on the front surface 2 a of the base member 2 and covering the upper part of the groove 3 . In the groove closing process, the front surface 2a of the base member 2 and the back surface 5b of the cover plate 5 are overlapped to form the overlapping portion J1.

The temporary bonding step is a step of bonding the overlapping portion J1 in advance. According to the present embodiment, in the temporary bonding step, the temporary bonding rotary tool G is inserted from the side surfaces of the base member 2 and the cover plate 5 to perform friction stir welding on the overlapping portion J1. After the temporary bonding process, the plasticized region W1 is formed on the side surfaces of the base member 2 and the cover plate 5 .

As shown in FIG. 13B , the final joining step is a step of performing friction stir welding on the overlapping portion J1 using the rotary tool F for final joining. Insert the front end side pin F3 of the rotary tool F for final joining that rotates from the front surface 5a of the cover plate 5, and relatively move the rotary tool F for final joining along the longitudinal direction of the groove 3 to perform friction stirring on the overlapping portion J1. engage. The movement path of the rotary tool F for final joining is set so that the plastic flow material does not flow into the groove 3 .

In the main joining process, friction stir welding is performed while pressing the front surface 5a of the cover plate 5 by the outer peripheral surface of the base end side pin F2. In the main joining step, friction is performed in a state in which the distal end side pin F3 is in contact with both the base member 2 and the cover plate 5 while the outer peripheral surface of the base end side pin F2 is brought into contact with the front surface 5a of the cover plate 5 . Stir to join. The insertion depths of the proximal end side pin F2 and the distal end side pin F3 may be appropriately set within a range in which the outer peripheral surface of the proximal end side pin F2 can press the front surface 5a of the cover plate 5 . In the present embodiment, the proximal side pin F2 is set so that the center portion in the height direction of the outer peripheral surface of the proximal end side pin F2 is brought into contact with the front surface 5 a of the cover plate 5 and the distal end side pin F3 is brought into contact with the base member 2 . Also in this way, substantially the same effects as those of the first embodiment can be obtained.

The heat transfer plate 1B can also be easily produced by placing a thick cover plate 5 on the front surface 2a of the base member 2 without providing the cover groove 4 as in the method of manufacturing the heat transfer plate according to the third embodiment. Moreover, by performing the temporary joining process, the base member 2 and the cover plate 5 can be prevented from being cracked when the main joining process is performed.

In addition, in the temporary bonding step, friction stirring may be discontinuously performed to intermittently form the plasticized region W1 by the rotary tool G for temporary bonding. In addition, in the temporary joining process, the overlapping portion J1 may be joined by welding. In addition, as in the first embodiment, the temporary joining process and the main joining process may be performed using a joint.

In addition, in the present embodiment, the tip of the tip side pin F3 is set so that the tip of the tip side pin F3 is press-fitted to the position where it reaches the base member 2, but it may be set so as not to reach the base member 2, that is, the insertion depth may be set so that The outer peripheral surface of the base end side pin F2 is in contact with the front surface 5 a of the cover plate 5 , and both the base end side pin F2 and the distal end side pin F3 are brought into contact with only the cover plate 5 . In this case, the overlapping portion J1 is plastically fluidized by frictional heat generated by the contact between the base end side pin F2 and the distal end side pin F3 and the cover plate 5 , and the overlapping portion J1 is joined.

In addition, in the present embodiment, the final joining rotary tool F is inserted from the front surface 5a of the cover plate 5, but the final joining rotary tool F may be inserted from the back surface 2b of the base member 2 to rub the overlapping portion J1 Stir. In this case, the outer peripheral surface of the base-end side pin F2 may be set in contact with the back surface 2b of the base member 2, and the distal-end side pin F2 may be press-fitted to contact both the base member 2 and the cover plate 5. The position may be set such that the front end side pin F2 is press-fitted to a position where only the base member 2 is in contact.

[Fourth Embodiment]

Next, a fourth embodiment of the present invention will be described. The manufacturing method of the thermally conductive plate of the fourth embodiment differs from the third embodiment in that the concave portion 20 including the large dimple is formed.

In the manufacturing method of the thermally conductive plate of the fourth embodiment, a preparation step, a recessed portion sealing step, a temporary bonding step, and a main bonding step are performed.

As shown in FIG. 14A , the preparation step is a step of preparing the base member 2 . The recessed part 20 is formed in the front surface 2a of the base member 2. As shown in FIG. The recess 20 is a much larger depression than the groove 3 .

The recessed portion closing step (closing step) is a step of placing the cover plate 5 on the front surface 2 a of the base member 2 and covering the upper portion of the recessed portion 20 . In the recess closing step, the front surface 2a of the base member 2 and the back surface 5b of the cover plate 5 are overlapped to form the overlapping portion J1. As shown in FIG. 14B , since the provisional bonding step and the main bonding step are the same as those of the third embodiment, detailed descriptions are omitted. Thereby, the thermally conductive plate 1C is formed.

In the manufacturing method of the thermally conductive plate of the fourth embodiment, substantially the same effects as those of the third embodiment can be obtained. Further, according to the fourth embodiment, even in the case where the concave portion 20 larger than the groove 3 is included and the cover plate 5 having a larger plate thickness is placed, the thermally conductive plate 1C can be easily formed.

In addition, in this embodiment, the front end of the front end side pin F3 is set so that the front end of the front end side pin F3 is press-fitted to the position where it reaches the base member 2, but it may be set so as not to reach the base member 2, that is, it may be set so that the base member 2 is not reached. The outer peripheral surface of the end side pin F2 is in contact with the front surface 5a of the cover plate 5, and the distal end of the distal end side pin F3 is pressed into the position where the proximal end side pin F2 and the distal end side pin F3 are in contact with only the cover plate 5 to overlap. Part J1 performs friction stirring. In this case, the base member 2 and the cover plate 5 are plastically fluidized by the frictional heat generated by the contact between the base end side pin F2 and the front end side pin F3 and the cover plate 5, and the overlapping portion J1 is joined.

In addition, in the present embodiment, the final joining rotary tool F is inserted from the front surface 5a of the cover plate 5, but the final joining rotary tool F may be inserted from the back surface 2b of the base member 2 to rub the overlapping portion J1 Stir. Even in this case, the outer peripheral surface of the proximal-end side pin F2 may be in contact with the back surface 2b of the base member 2, and the distal-end side pin F3 may be set to be press-fitted to both the base member 2 and the cover plate 5 The position of contact may be set so that the front-end side pin F3 is press-fitted to a position where only the base member 2 is in contact to perform friction stirring.

[Fifth Embodiment]

Next, a friction stir welding method according to a fifth embodiment of the present invention will be described. The fifth embodiment is different from the other embodiments in that metal members that do not include flow paths such as the groove 3 or the recessed portion 20 are joined to each other.

In the friction stir welding method of the fifth embodiment, a preparation process, a superimposition process (superimposed portion forming process), a temporary joining process, and a main joining process are performed.

As shown in FIG. 15 , the preparation step is a step of preparing the metal members 31 and 32 . The metal members 31 and 32 are plate-shaped metal members. The type of the metal members 31 and 32 may be appropriately selected from metals capable of friction stirring. For example, the type of material of the metal member 32 into which the rotary tool F for final joining is inserted may be a type of material having a hardness lower than that of the metal member 31 .

The overlapping step (overlapping portion forming step) is a step of overlapping the metal members 31 and 32 . In the overlapping step, the back surface 32b of the metal member 32 is overlapped with the front surface 31a of the metal member 31 to form the overlapping portion J1.

The temporary bonding step is a step of bonding the overlapping portion J1 in advance. According to the present embodiment, in the temporary bonding step, the temporary bonding rotary tool G is inserted from the side surfaces of the metal members 31 and 32 to perform friction stir welding on the overlapping portion J1. After the temporary bonding step, the plasticized region W1 is formed on the side surfaces of the metal members 31 and 32 .

The final welding step is a step of performing friction stir welding on the overlapping portion J1 using the rotary tool F for final welding. In this embodiment, it is set so that the rotary tool F for final joining may be inserted vertically from the front surface 32a of the metal member 32, and the front end of the front-end|tip side pin F3 may enter the metal member 31. The final welding step is a step of performing friction stir welding on the overlapping portion J1 using the rotary tool F for final welding. The front end side pin F3 of the rotating final welding rotary tool F is inserted from the front surface 32a of the metal member 32, and the final welding rotary tool F is relatively moved to perform friction stir welding on the overlapping portion J1. In the main joining process, friction stir welding is performed while pressing the front surface 32a of the metal member 32 by the outer peripheral surface of the base end side pin F2. In the main joining step, friction stir welding is performed in a state in which the distal side pin F3 is in contact with both the metallic members 31 and 32 while the outer peripheral surface of the proximal end side pin F2 is in contact with the front surface 32a of the metallic member 32 . . Thereby, the composite board 1D is formed.

According to the friction stir welding method of the fifth embodiment, the composite plate 1D in which the flow path is not provided inside can be easily formed. Also according to the friction stir welding method of the fifth embodiment, substantially the same effects as those of the third embodiment can be obtained.

In addition, by performing the temporary bonding step, it is possible to prevent cracks between the metal members 31 and 32 when the main bonding step is performed.

In addition, in the temporary bonding step, friction stirring may be discontinuously performed to intermittently form the plasticized region W1 by the rotary tool G for temporary bonding. In addition, in the temporary joining process, the overlapping portion J1 may be joined by welding. In addition, as in the first embodiment, the temporary joining process and the main joining process may be performed using a joint.

In addition, as shown in FIG. 16 , when the main joining process is performed, it may be set so that the distal end side pin F3 does not reach the metal member 31 , that is, the outer peripheral surface of the proximal end side pin F2 may be set so that the metal member The front surface 32a of 32 is brought into contact, and the base end side pin F2 and the distal end side pin F3 are brought into contact with only the metal member 32 to perform friction stirring. In this case, by bringing the plasticized region W into contact with the overlapping portion J1, the metal members 31 and 32 can be joined to each other. That is, the metal members 31 and 32 are plastically fluidized by the frictional heat generated by the contact between the proximal end side pin F2 and the distal end side pin F3 and the metal member 32, and the overlapping portion J1 can be joined. Thereby, the composite board 1E is formed.

(Symbol Description)

1 heat conduction plate;

2 base member;

3 grooves;

4 cover slots;

5 cover plate;

6 pipes for heat medium;

10 connectors;

20 recesses;

31 Metal components;

32 Metal components;

F Rotary tool for formal engagement (rotation tool);

F2 base end side pin;

F3 Front side pin;

G Rotary tool for temporary engagement;

J docking part;

J1 coincidence part;

W Plasticization region.

Claims (19)

1. a manufacturing method of a thermally conductive plate, characterized in that, comprising: a cover plate inserting process in which the cover plate is inserted into a cover groove formed around a groove opened in the front surface of the base member; and A final joining step in which a rotary tool including a base end side pin and a front end side pin is relatively moved along the butting portion of the side wall of the cover groove and the side surface of the cover plate to perform friction stirring, The taper angle of the base end side pin is 135° to 160°, and is larger than the taper angle of the front end side pin, A stepped portion having a spiral shape in plan view and a stepped portion in side view is formed on the outer peripheral surface of the base end side pin, and the stepped angle formed by the stepped bottom surface and the stepped side surface of the stepped portion is 85° to 120°, A helical groove is engraved on the outer peripheral surface of the front-end side pin, and the helical angle formed by the helical bottom surface and the helical side surface of the helical groove is 45° to 90°. In the main joining step, the front end side pin of the rotating tool that is rotated is inserted into the abutting portion, and the outer peripheral surface of the base end side pin is brought into contact with the front surface of the base member and the cover plate. The friction stirring of the abutting portion is performed while pressing the plastic flow material by the stepped bottom surface of the stepped portion in the state of . 2. The method for manufacturing a thermally conductive plate according to claim 1, wherein A provisional joining process is included before the main joining process, and in the provisional joining process, the abutting portion is provisionally joined. 3. The method for manufacturing a thermally conductive plate according to claim 1, characterized in that, In the main joining step, the rotation is performed so that the vicinity of the center portion in the height direction of the outer peripheral surface of the base end side pin comes into contact with the front surface of the base member and the front surface of the cover plate. Tool insert. 4. The method for manufacturing a thermally conductive plate according to claim 1, wherein After the completion of the main joining process, a burr cutting process is included in which the burrs generated by the friction stirring of the rotary tool are cut off. 5. A method of manufacturing a thermally conductive plate, comprising: a heat medium pipe inserting step of inserting the heat medium pipe into a groove formed on a bottom surface of a cover groove opened on the front surface of the base member; a cover inserting step of inserting a cover into the cover groove; and A final joining step in which a rotary tool including a base end side pin and a front end side pin is relatively moved along the butting portion of the side wall of the cover groove and the side surface of the cover plate to perform friction stirring, The taper angle of the base end side pin is 135° to 160°, which is larger than the taper angle of the front end side pin. Step-shaped level difference part, the level difference angle formed by the level difference bottom surface and the level difference side surface of the level difference part is 85°～120°, A helical groove is engraved on the outer peripheral surface of the front-end side pin, and the helical angle formed by the helical bottom surface and the helical side surface of the helical groove is 45° to 90°. In the main joining step, the front end side pin of the rotating tool that is rotated is inserted into the abutting portion, and the outer peripheral surface of the base end side pin is brought into contact with the front surface of the base member and the cover plate. The friction stirring of the abutting portion is performed while pressing the plastic flow material by the stepped bottom surface of the stepped portion in the state of . 6. The method for manufacturing a thermally conductive plate according to claim 5, wherein A provisional joining process is included before the main joining process, and in the provisional joining process, the abutting portion is provisionally joined. 7. The method for manufacturing a thermally conductive plate according to claim 5, wherein In the main joining step, the rotation is performed so that the vicinity of the center portion in the height direction of the outer peripheral surface of the base end side pin comes into contact with the front surface of the base member and the front surface of the cover plate. Tool insert. 8. The method for manufacturing a thermally conductive plate according to claim 5, wherein After the completion of the main joining process, a burr cutting process is included in which the burrs generated by the friction stirring of the rotary tool are cut off. 9. A method of manufacturing a thermally conductive plate, comprising: a sealing process, in which the cover plate is made to overlap the front surface of the base member to cover the groove or recess opened on the front surface of the base member; and A final joining step in which a rotary tool including a base end side pin and a front end side pin is inserted from the front surface of the cover plate, and the rotary tool is connected to the base member along the front surface of the base member. The overlapping portion on the back of the cover plate moves relatively, The taper angle of the base end side pin is 135° to 160°, and is larger than the taper angle of the front end side pin, A stepped portion having a spiral shape in plan view and a stepped portion in side view is formed on the outer peripheral surface of the base end side pin, and the stepped angle formed by the stepped bottom surface and the stepped side surface of the stepped portion is 85° to 120°, A helical groove is engraved on the outer peripheral surface of the front-end side pin, and the helical angle formed by the helical bottom surface and the helical side surface of the helical groove is 45° to 90°. In the main joining step, the front end side pin is brought into contact with both the base member and the cover plate while the outer peripheral surface of the base end side pin is brought into contact with the front surface of the cover plate, or The friction stirring of the overlapping portion is performed while the plastic flow material is pressed by the stepped bottom surface of the stepped portion in a state where only the cover plate is in contact. 10. The method for manufacturing a thermally conductive plate according to claim 9, wherein A temporary bonding step is included before the main bonding step. In the temporary bonding step, the overlapping portion is temporarily bonded. 11. The method for manufacturing a thermally conductive plate according to claim 9, wherein: In the said final joining process, the said rotation tool is inserted so that the center part vicinity in the height direction of the said outer peripheral surface of the said base end side pin may contact the front surface of the said cover plate. 12. The method for manufacturing a thermally conductive plate according to claim 9, wherein After the completion of the main joining process, a burr cutting process is included in which the burrs generated by the friction stirring of the rotary tool are cut off. 13. A method of manufacturing a thermally conductive plate, comprising: a sealing process, in which the cover plate is made to overlap the front surface of the base member to cover the groove or recess opened on the front surface of the base member; and A final joining step in which a rotary tool including a base end side pin and a front end side pin is inserted from the back surface of the base member, and the rotary tool is connected to the base member along the front surface of the base member. The overlapping portion on the back of the cover plate moves relatively, The taper angle of the base end side pin is 135° to 160°, and is larger than the taper angle of the front end side pin, A stepped portion having a spiral shape in plan view and a stepped portion in side view is formed on the outer peripheral surface of the base end side pin, and the stepped angle formed by the stepped bottom surface and the stepped side surface of the stepped portion is 85° to 120°, A helical groove is engraved on the outer peripheral surface of the front-end side pin, and the helical angle formed by the helical bottom surface and the helical side surface of the helical groove is 45° to 90°. In the main joining step, the front end side pin is brought into contact with both the base member and the cover plate while the outer peripheral surface of the base end side pin is brought into contact with the back surface of the base member, or The friction stirring of the overlapping portion is performed while the plastic flow material is pressed by the stepped bottom surface of the stepped portion in a state of being in contact with only the base member. 14. The method for manufacturing a thermally conductive plate according to claim 13, wherein A temporary bonding step is included before the main bonding step. In the temporary bonding step, the overlapping portion is temporarily bonded. 15. The method for manufacturing a thermally conductive plate according to claim 13, wherein: After the completion of the main joining process, a burr cutting process is included in which the burrs generated by the friction stirring of the rotary tool are cut off. 16. A friction stir welding method for joining two metal members using a rotary tool including a base end side pin and a distal end side pin, wherein: The taper angle of the base end side pin is 135° to 160°, and is larger than the taper angle of the front end side pin, A stepped portion having a spiral shape in plan view and a stepped portion in side view is formed on the outer peripheral surface of the base end side pin, and the stepped angle formed by the stepped bottom surface and the stepped side surface of the stepped portion is 85° to 120°, A helical groove is engraved on the outer peripheral surface of the front-end side pin, and the helical angle formed by the helical bottom surface and the helical side surface of the helical groove is 45° to 90°. The friction stir welding method includes: an overlapping portion forming step, in which the overlapping portion is formed by overlapping the front surface of one of the metal members with the rear surface of the other metal member to form an overlapping portion; and A final joining step in which the front end side pin of the rotating tool that is rotated is inserted from the front surface of the other metal member, and the outer peripheral surface of the base end side pin is aligned with the other side. In a state in which the front side of the metal member is in contact with both the one metal member and the other metal member, or the tip side pin is in contact with only the other metal member, The friction stirring of the overlapping portion is performed while the plastic flow material is pressed by the stepped bottom surface of the stepped portion, The hardness of the other metal member is set to be lower than the hardness of the one metal member. 17. The friction stir welding method of claim 16, wherein A temporary bonding step is included before the main bonding step. In the temporary bonding step, the overlapping portion is temporarily bonded. 18. The friction stir welding method of claim 16, wherein In the main joining step, the rotary tool is inserted so that the vicinity of the center portion in the height direction of the outer peripheral surface of the proximal end side pin is in contact with the front surface of the other metal member. 19. The friction stir welding method of claim 16, wherein After the completion of the main joining process, a burr cutting process is included in which the burrs generated by the friction stirring of the rotary tool are cut off.

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